Begin by sautéing the beef in 1/2 T butter along with 1/2 tsp. minced garlic and Montreal Steak Seasoning (to taste) until sides are seared. Then cook over medium-low heat in the skillet for 10-15 minutes until beef is cooked to your preferred doneness.

In a second large skillet, melt the remaining 1/2 T butter. Add in sliced mushrooms and onion. Sauté until liquid from the mushrooms has evaporated and the onions are translucent, about 10 minutes.

Add the beef and mushroom onion mixture together.

Slice open your whole wheat bun, and top with cheese. Place under the broiler for 2 minutes, watching carefully to prevent burning. Cheese should be nicely melted at this point. If not, return the the broiler until melted.

When cooking, please make sure to follow kitchen hygiene and safety -- cook meat until internal temperature is at safe levels, always check labels for allergens, and use caution in the kitchen -- I love sharing recipes, but I am not liable for damages done as a result of trying these recipes.